monte carlo method to calculate failure

Need help with this code i am suppose to find the probability failure and and the reliability of the beam

%USE MONTE CARLO METHOD TO CALCULATE PROBABILITY OF FAILUREAND...RELIABILITY INDEX FOR THE GIVEN BEAM

%The given limit state function for the given beam is 
%g = L/360 - 0.0069*(w*L^4)/(E*I);

%Given :
%The total length of the beam is 15 meters

L = 5;
n = 100000000;

%Unit Weight
mean_w = 10;
sigma_w = 0.4;

%Young's Modulus 
mean_E = 2*10^7;
sigma_E = 0.5*10^7;

%Moment of Inertia
mean_I = 8*10^-4;
sigma_I = 1.5*10^-4;


%Now use normrnd function
w = normrnd(mean_w, sigma_w, [n,1]);
E = normrnd(mean_E, sigma_E, [n,1]);
I = normrnd(mean_I, sigma_I, [n,1]);

%
g = zeros(n,1);
K = 0;

%Create for loop
for i=1:n
    g(i,1) = L/360 - 0.0069*(w(i,1)*L^4)/(E(i,1)*I(i,1));
    if g(i,1)<0
        K = K + 1;
    end
end

P_fail = K/n;

[the cyclist]

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